The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 1980
Filed:
Dec. 20, 1978
Edward E Kirkham, Brookfield, WI (US);
Kearney & Trecker Corporation, West Allis, WI (US);
Abstract
A Drawbolt is rotatably mounted within the spindle of a machine tool to secure a toolholder to a socket in the front end of the spindle. First and second spur gears are formed on the rear end of the spindle and drawbolt, respectively, and are positioned side by side. The two spur gears are equal in diameter, but have differing numbers of teeth. A planetary gear cage surrounds the spur gears and has pinion gears which are meshed with both spur gears. The planetary gear cage is attached to the armature of an electric motor which, when energized, rotates the cage and thus causes rotation of the drawbolt at a reduced speed. The speed reduction depends on the difference in the number of teeth in the two spur gears. The armature is axially shiftable to move a locking ring on the planetary gear cage into and out of engagement with the spur gear on the spindle.